Bank to bank data transfer

ABSTRACT

The present disclosure includes apparatuses and methods for bank to bank data transfer. An example apparatus includes a plurality of banks of memory cells, an internal bus configured to transfer data between the plurality of banks and an external bus interface, and a bank-to-bank transfer bus configured to transfer data between the plurality of banks.

PRIORITY INFORMATION

This application is a Continuation of U.S. application Ser. No. 15/595,171, filed May 15, 2017, the contents of which are included herein by reference.

TECHNICAL FIELD

The present disclosure relates generally to semiconductor memory and methods, and more particularly, to apparatuses and methods for bank to bank data transfer.

BACKGROUND

Memory devices are typically provided as internal, semiconductor, integrated circuits in computers or other electronic systems. There are many different types of memory including volatile and non-volatile memory. Volatile memory can require power to maintain its data (e.g., host data, error data, etc.) and includes random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), synchronous dynamic random access memory (SDRAM), and thyristor random access memory (TRAM), among others. Non-volatile memory can provide persistent data by retaining stored data when not powered and can include NAND flash memory, NOR flash memory, and resistance variable memory such as phase change random access memory (PCRAM), resistive random access memory (RRAM), and magnetoresistive random access memory (MRAM), such as spin torque transfer random access memory (STT RAM), among others.

Electronic systems often include a number of processing resources (e.g., one or more processors), which may retrieve and execute instructions and store the results of the executed instructions to a suitable location. A processor can comprise a number of functional units such as arithmetic logic unit (ALU) circuitry, floating point unit (FPU) circuitry, and a combinatorial logic block, for example, which can be used to execute instructions by performing an operation on data (e.g., one or more operands). As used herein, an operation can be, for example, a Boolean operation, such as AND, OR, NOT, NAND, NOR, and XOR, and/or other operations (e.g., invert, shift, arithmetic, statistics, among many other possible operations). For example, functional unit circuitry may be used to perform the arithmetic operations, such as addition, subtraction, multiplication, and division on operands, via a number of operations.

A number of components in an electronic system may be involved in providing instructions to the functional unit circuitry for execution. The instructions may be executed, for instance, by a processing resource such as a controller and/or host processor. Data (e.g., the operands on which the instructions will be executed) may be stored in a memory array that is accessible by the functional unit circuitry. The instructions and/or data may be retrieved from the memory array and sequenced and/or buffered before the functional unit circuitry begins to execute instructions on the data. Furthermore, as different types of operations may be executed in one or multiple clock cycles through the functional unit circuitry, intermediate results of the instructions and/or data may also be sequenced and/or buffered. A sequence to complete an operation in one or more clock cycles may be referred to as an operation cycle. Time consumed to complete an operation cycle costs in terms of processing and computing performance and power consumption, of a computing apparatus and/or system.

In many instances, the processing resources (e.g., processor and associated functional unit circuitry) may be external to the memory array, and data is accessed via a bus between the processing resources and the memory array to execute a set of instructions. Processing performance may be improved in a processor-in-memory (PIM) device, in which a processor may be implemented internally and near to a memory (e.g., directly on a same chip as the memory array). A processing-in-memory device may save time and/or power by reducing and/or eliminating external communications.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a block diagram of an apparatus in the form of a computing system including a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 1B is another block diagram of an apparatus in the form of a computing system including a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 2 is a schematic diagram illustrating sensing circuitry of a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 3 is a schematic diagram illustrating circuitry for data transfer in a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 4A is block diagram illustrating a number of banks of a memory device coupled to a bank-to-bank bus in accordance with a number of embodiments of the present disclosure.

FIG. 4B is another block diagram illustrating a number of banks of a memory device coupled to a bank-to-bank bus in accordance with a number of embodiments of the present disclosure.

FIG. 4C is another block diagram illustrating a number of banks of a memory device coupled to a bank-to-bank bus in accordance with a number of embodiments of the present disclosure.

FIG. 4D is another block diagram illustrating a number of banks of a memory device coupled to a bank-to-bank bus in accordance with a number of embodiments of the present disclosure.

FIG. 5 is a schematic diagram illustrating sensing circuitry capable of implementing an XOR logical operation in accordance with a number of embodiments of the present disclosure.

FIG. 6 is a logic table illustrating selectable logic operation results implemented by a sensing circuitry shown in FIG. 5 in accordance with a number of embodiments of the present disclosure.

DETAILED DESCRIPTION

The present disclosure includes apparatuses and methods to transfer data between banks of memory cells. An example apparatus includes a plurality of banks of memory cells, an internal bus configured to transfer data between the plurality of banks, an external bus (e.g., an external bus interface), and a bank-to-bank transfer bus configured to transfer data between the plurality of banks.

A memory (e.g., one or more memory device(s)) may include a plurality of banks (e.g., memory banks) that can transfer data to an external interface (e.g., a host interface) via an internal bus. The internal bus may be used to move data from one bank to another, which may be useful if data is being used spans multiple banks. This may be especially useful for instances in which the sensing circuitry serves as a number of 1-bit processing elements on a column-by-column basis, such as in a processing-in-memory (PIM) implementation. However, moving data bank-to-bank using an internal bus may be inefficient.

Embodiments of the present disclosure can provide improved efficiency of bank-to-bank transfer (BBT), among other benefits. For instance, according to some embodiments, data may be transferred bank-to-bank via a BBT bus separate from the internal bus while the internal bus is in use. In some embodiments, multiple bank-to-bank transfers may be performed in parallel on the BBT bus, etc.

In some embodiments, data may be transferred via the BBT bus to various memory banks in a unidirectional path along the BBT transfer bus; however, embodiments are not so limited, and in some embodiments, data may transferred via the BBT bus to various memory banks bi-directionally. Data transfer between the banks via the BBT bus may be optimized such that an amount of power consumption and/or an amount of time associated with the data transfer is minimized. For example, data transfer between the banks via the BBT bus may be performed by determining and/or selecting a shortest path and/or a path that takes a shortest amount of time and transferring the data via the shortest path and/or the path that takes the shortest amount of time to complete the data transfer.

As described in more detail below, embodiments can allow for data transfer between banks of memory cells on a memory bank bus that is internal to a memory device and/or using a BBT bus. The data transfer between banks of memory cells can occur on the BBT bus without using a separate internal and/or external data bus. An external data bus (e.g., an I/O bus) can be used to transfer data between a memory device comprising banks of memory cells and other external apparatuses, such as a host and/or another memory device, for example. The transfer of data between the banks of memory cells and other apparatuses external to the banks of memory cells can use a data path that includes the BBT bus, internal data bus, and/or the external data bus. Some embodiments of the present disclosure can allow for data transfer between banks of memory cells on a BBT bus without transferring data on a separate internal data bus and/or an external data bus, and/or concurrently with data being transferred on the separate internal bus and/or external data bus.

In the following detailed description of the present disclosure, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration how one or more embodiments of the disclosure may be practiced. These embodiments are described in sufficient detail to enable those of ordinary skill in the art to practice the embodiments of this disclosure, and it is to be understood that other embodiments may be utilized and that process, electrical, and structural changes may be made without departing from the scope of the present disclosure.

As used herein, designators such as “X”, “Y”, “N”, “M”, etc., particularly with respect to reference numerals in the drawings, indicate that a number of the particular feature so designated can be included. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. As used herein, the singular forms “a”, “an”, and “the” can include both singular and plural referents, unless the context clearly dictates otherwise. In addition, “a number of”, “at least one”, and “one or more” (e.g., a number of memory banks) can refer to one or more memory banks, whereas a “plurality of” is intended to refer to more than one of such things. Furthermore, the words “can” and “may” are used throughout this application in a permissive sense (i.e., having the potential to, being able to), not in a mandatory sense (i.e., must). The term “include,” and derivations thereof, means “including, but not limited to.” The terms “coupled” and “coupling” mean to be directly or indirectly connected physically or for access to and movement (transmission) of commands and/or data, as appropriate to the context. The terms “data” and “data values” are used interchangeably herein and can have the same meaning, as appropriate to the context.

The figures herein follow a numbering convention in which the first digit or digits correspond to the figure number and the remaining digits identify an element or component in the figure. Similar elements or components between different figures may be identified by the use of similar digits. For example, 150 may reference element “50” in FIG. 1, and a similar element may be referenced as 250 in FIG. 2. As will be appreciated, elements shown in the various embodiments herein can be added, exchanged, and/or eliminated so as to provide a number of additional embodiments of the present disclosure. In addition, the proportion and/or the relative scale of the elements provided in the figures are intended to illustrate certain embodiments of the present disclosure and should not be taken in a limiting sense.

FIG. 1A is a block diagram of an apparatus in the form of a computing system 100 including a memory device 120 in accordance with a number of embodiments of the present disclosure. As used herein, a memory device 120, controller 140, channel controller 143, bank arbiter 145, high speed interface (HSI), memory array 130, sensing circuitry 150, and/or a number of additional latches 170 might also be separately considered an “apparatus.”

As used herein, the additional latches 170 are intended to provide additional functionalities (e.g., peripheral amplifiers) that sense (e.g., read, store, cache) data values of memory cells in an array and that are distinct from the sense amplifiers of the sensing component stripes described herein (e.g., as shown at 206 in FIG. 2 and at corresponding reference number in FIG. 3). As such, the additional latches can be included in a “latch component 170.” For example, latches of the latch component 170 can be located on a periphery of a bank 121 of the memory device. In contrast, the sense amplifiers located in a plurality of sensing component stripes may be physically associated with each subarray of memory cells in the bank (e.g., bank 121 illustrated in FIG. 1B).

System 100 in FIG. 1A includes a host 110 coupled (e.g., connected) to memory device 120, which includes a memory array 130. Host 110 can be a host system such as a personal laptop computer, a desktop computer, a digital camera, a smart phone, or a memory card reader, among various other types of hosts. Host 110 can include a system motherboard and/or backplane and can include a number of processing resources (e.g., one or more processors, microprocessors, or some other type of controlling circuitry). The system 100 can include separate integrated circuits or both the host 110 and the memory device 120 can be on the same integrated circuit. The system 100 can be, for instance, a server system and/or a high performance computing (HPC) system and/or a portion thereof. Although the examples shown in FIGS. 1A-1B illustrate a system having a Von Neumann architecture, embodiments of the present disclosure can be implemented in non-Von Neumann architectures, which may not include one or more components (e.g., CPU, ALU, etc.) often associated with a Von Neumann architecture.

For clarity, the system 100 has been simplified to focus on features with particular relevance to the present disclosure. The memory array 130 can be a DRAM array, SRAM array, STT RAM array, PCRAM array, TRAM array, RRAM array, NAND flash array, and/or NOR flash array, among other types of arrays. The array 130 can include memory cells arranged in rows coupled by access lines (which may be referred to herein as word lines or select lines) and columns coupled by sense lines (which may be referred to herein as data lines or digit lines). Although a single array 130 is shown in FIG. 1, embodiments are not so limited. For instance, memory device 120 may include a number of arrays 130 (e.g., a number of banks of DRAM cells, NAND flash cells, etc.).

The memory device 120 can include address circuitry 142 to latch address signals provided over a combined data/address bus 156 (e.g., an external I/O bus connected to the host 110) by I/O circuitry 144, which can comprise an internal I/O bus. The internal I/O bus (e.g., internal bus 147-1, . . . , 147-N illustrated in FIG. 1B), can transfer data between memory banks and I/O pins (e.g., DRAM DQs), for example. In some embodiments, the internal I/O bus may be configured to transfer data between the memory banks and I/O pins concurrently with the BBT bus transferring data between the memory banks.

Status and exception information can be provided from the controller 140 of the memory device 120 to a channel controller 143, for example, through an out-of-band (OOB) bus 157, which in turn can be provided from the channel controller 143 to the host 110. The channel controller 143 can include a logic component 160 to allocate a plurality of locations (e.g., controllers for subarrays) in the arrays of each respective bank to store bank commands, application instructions (e.g., for sequences of operations), and arguments (e.g., PIM commands) for the various banks associated with operations of each of a plurality of memory devices (e.g., 120-1, . . . , 120-N as shown in FIG. 1B). The channel controller 143 can send commands (e.g., PIM commands) to the plurality of memory devices 120-1, . . . , 120-N to store those program instructions within a given bank of a memory device. As used herein, “PIM commands” are commands executed by processing elements within a memory bank (e.g., via sensing circuitry 150), as opposed to normal DRAM commands (e.g., read/write commands) that result in data being operated on by an external processing component such as the host 110.

Address signals are received through address circuitry 142 and decoded by a row decoder 146 and a column decoder 152 to access the memory array 130. Data can be sensed (read) from memory array 130 by sensing voltage and/or current changes on sense lines (digit lines) using a number of sense amplifiers, as described herein, of the sensing circuitry 150. A sense amplifier can read and latch a page (e.g., a row) of data from the memory array 130. Additional compute circuitry, as described herein, can be coupled to the sensing circuitry 150 and can be used in combination with the sense amplifiers to sense, store (e.g., cache and/or buffer), perform compute functions (e.g., operations), and/or move data. The I/O circuitry 144 can be used for bi-directional data communication with host 110 over the data bus 156 (e.g., a 64 bit wide data bus). The write circuitry 148 can be used to write data to the memory array 130.

Controller 140 (e.g., bank control logic and sequencer) can decode signals (e.g., commands) provided by control bus 154 from the host 110. These signals can include chip enable signals, write enable signals, and/or address latch signals that can be used to control operations performed on the memory array 130, including data sense, data store, data movement (e.g., copying, transferring, and/or transporting data values), data write, and/or data erase operations, among other operations. In various embodiments, the controller 140 can be responsible for executing instructions from the host 110 and accessing the memory array 130. The controller 140 can be a state machine, a sequencer, or some other type of controller.

Examples of the sensing circuitry 150 are described further below (e.g., in FIGS. 2 and 3). For instance, in a number of embodiments, the sensing circuitry 150 can include a number of sensing components (e.g., a number of sense amplifiers and compute components), which may serve as an accumulator and can be used to perform operations in each subarray (e.g., on data associated with complementary sense lines).

In a number of embodiments, the sensing circuitry 150 can be used to perform operations using data stored in memory array 130 as inputs and participate in movement of the data for copy, transfer, writing, logic, and/or storage operations to a different location in the memory array 130 without transferring the data via a sense line address access (e.g., without firing a column decode signal). As such, various compute functions can be performed using, and within, sensing circuitry 150 rather than (or in association with) being performed by processing resources external to the sensing circuitry 150 (e.g., by a processor associated with host 110 and/or other processing circuitry, such as ALU circuitry, located on memory device 120, such as on controller 140 or elsewhere).

In various previous approaches, data associated with an operand, for instance, would be read from memory via sensing circuitry and provided to external ALU circuitry via I/O lines (e.g., via local I/O lines and/or global I/O lines) and/or an external data bus (e.g., data bus 156 in FIG. 1B). The external ALU circuitry could include a number of registers and would perform compute functions using the operands, and the result would be transferred back to the array via the I/O lines. In contrast, in a number of embodiments of the present disclosure, sensing circuitry 150 is configured to perform operations on data stored in memory array 130 and store the result back to the memory array 130 without enabling an I/O line (e.g., a local I/O line) coupled to the sensing circuitry 150. In various embodiments, methods, and apparatuses are provided which can function as a PIM RAM. As used herein, “PIM RAM” refers to random access memory in which operations may be performed without transferring the data on which the operations are to be performed to an external location such as a host processor via an external bus (e.g., bus 156). In PIM RAM operation it is useful to transfer data between banks without using a data bus external to the die. The sensing circuitry 150 can be formed on a same pitch as sense lines of the array. The latch component 170 can include latches, as described herein, and can be coupled to the sensing circuitry 150 via a shared I/O line, but can be distinct from the sensing circuitry 150.

In a number of embodiments, circuitry external to array 130 and sensing circuitry 150 is not needed to perform compute functions as the sensing circuitry 150 can be controlled to perform the appropriate operations associated with such compute functions without the use of an external processing resource. In some embodiments, sensing components can serve as 1-bit processing elements on a per column basis. Therefore, the sensing circuitry 150 may be used to complement or to replace, at least to some extent, such an external processing resource (or at least the bandwidth consumption of such an external processing resource).

However, in a number of embodiments, the sensing circuitry 150 may be used to perform operations (e.g., to execute instructions) in addition to operations performed by an external processing resource (e.g., host 110). For instance, host 110 and/or sensing circuitry 150 may be limited to performing only certain operations and/or a certain number of operations.

Enabling an I/O line can include enabling (e.g., turning on, activating) a transistor having a gate coupled to a decode signal (e.g., a column decode signal) and a source/drain coupled to the I/O line. However, embodiments are not limited to not enabling an I/O line. For instance, in a number of embodiments, the sensing circuitry 150 can be used to perform operations without enabling column decode lines of the array; however, the local I/O line(s) may be enabled in order to transfer a result to a suitable location other than back to the array 130, for example, to an external register. Enabling (e.g., firing) a DQ pin can similarly consume significant power and time (e.g., require additional clock cycles (tck) for data transfers).

FIG. 1B is a block diagram of another apparatus architecture in the form of a computing system 100 including a plurality of memory devices 120-1, . . . , 120-N coupled to a host 110 via a channel controller 143 in accordance with a number of embodiments of the present disclosure. In at least one embodiment, the channel controller 143 may be coupled to and integrated with the plurality of banks of the memory device 120 and/or the channel controller 143 may be coupled to and integrated with the host 110. The channel controller 143 can be coupled to each of the plurality of banks 121-0, . . . , 121-7 of the memory device 120 via a control bus 154, which in turn can be coupled to the host 110. The channel controller 143 can also be coupled to each of the plurality of banks via a combined data/address bus 156, which in turn can be coupled to the host 110. In addition, the channel controller 143 can be coupled to each of the plurality of banks via an OOB (out-of-band) bus 157 associated with an HSI (high speed interface) 141-1, . . . , 141-N, also referred to herein as a status channel interface, which is configured to report status, exception, and other data information to the channel controller 143 and/or the host 110.

The channel controller 143 can receive the status and exception information from the HSI associated with a bank arbiter 145 associated with each of the plurality of banks. The bank arbiter 145 can sequence and control data movement within the plurality of banks (e.g., Bank 0, Bank 1, . . . , Bank 6, Bank 7, etc., as shown in FIG. 1B). A controller 140 can be associated with each particular bank (e.g., Bank 0, . . . , Bank 7) in a given memory device 120 and can decode signals provided by control bus 154 from the host 110. Each of the plurality of banks can include the controller 140 and other components, including an array of memory cells 130 and sensing circuitry 150, and/or latch component 170, etc.

In a number of embodiments, the bank arbiter 145 may be coupled to an internal data bus 147. For example, each respective bank arbiter 145-1, . . . , 145-N may be coupled to a respective internal data bus 147-1, . . . , 147-N. The internal data bus may be configured to transfer data between the plurality of banks (e.g., Bank zero (0), Bank one (1), . . . , Bank six (6), Bank seven (7), etc.) and an external data bus (e.g., bus 156). The internal data bus 147 may be configured to transfer data between the plurality of banks and the external data bus in parallel with data transfer operations being performed between the plurality of banks via a bank-to-bank transfer (BBT) bus 132.

The channel controller 143 can include one or more local buffers 159 to store program instructions and can include logic 160 to allocate a plurality of locations (e.g., subarrays or portions of subarrays) in the arrays of each respective bank to store bank commands, and arguments (e.g., PIM commands) for the various banks associated with operation of each of the plurality of memory devices 120-1, . . . , 120-N. The channel controller 143 can send commands (e.g., PIM commands) to the plurality of memory devices 120-1, . . . , 120-N to store those program instructions within a given bank of a memory device. These program instructions and PIM commands may need to be moved in a bank-to-bank data transfer (BBT) within a memory device.

In some embodiments, each of the plurality of memory devices 120-1, . . . , 120-N may include a respective bank-to-bank transfer (BBT) bus 132-1, . . . , 132-N. Each respective BBT bus 132-1, . . . , 132-N may facilitate bank-to-bank transfer(s) of data between banks, e.g., Bank 0, . . . , Bank 7, as described in further detail herein. The BBT bus 132-1, . . . , 132-N may comprise a ring (e.g., a token ring) architecture. For example, the BBT bus 132-1, . . . , 132-N may form a physical ring, which may encircle memory banks (e.g., Bank 0, . . . , Bank 7) associated with each respective memory device 120-1, . . . , 120-N. In some embodiments, BBT bus 132-1, . . . , 132-N may be driven bi-directionally (e.g., left or right) via BBT bus control components. For example, a direction of movement through the BBT bus 132-1, . . . , 132-N may be a programmable feature. In a number of embodiments, the BBT bus 132 is separate (e.g., physically distinct) from internal data bus 147.

FIG. 2 is a schematic diagram illustrating sensing circuitry 250 in accordance with a number of embodiments of the present disclosure. The sensing circuitry 250 can correspond to sensing circuitry 150 shown in FIG. 1A.

A memory cell can include a storage element (e.g., capacitor) and an access device (e.g., transistor). For instance, a first memory cell can include transistor 202-1 and capacitor 203-1, and a second memory cell can include transistor 202-2 and capacitor 203-2, etc. In this embodiment, the memory array 230 is a DRAM array of 1T1C (one transistor one capacitor) memory cells, although other embodiments of configurations can be used (e.g., 2T2C with two transistors and two capacitors per memory cell). In a number of embodiments, the memory cells may be destructive read memory cells (e.g., reading the data stored in the cell destroys the data such that the data originally stored in the cell is refreshed after being read).

The cells of the memory array 230 can be arranged in rows coupled by access (word) lines 204-X (Row X), 204-Y (Row Y), etc., and columns coupled by pairs of complementary sense lines (e.g., digit lines DIGIT(D) and DIGIT(D)_ shown in FIG. 2 and DIGIT_0 and DIGIT_0* shown in FIG. 3). The individual sense lines corresponding to each pair of complementary sense lines can also be referred to as digit lines 205-1 for DIGIT (D) and 205-2 for DIGIT (D)_, respectively, or corresponding reference numbers in FIG. 3. Although only one pair of complementary digit lines are shown in FIG. 2, embodiments of the present disclosure are not so limited, and an array of memory cells can include additional columns of memory cells and digit lines (e.g., 4,096, 8,192, 16,384, etc.).

Although rows and columns are illustrated as orthogonally oriented in a plane, embodiments are not so limited. For example, the rows and columns may be oriented relative to each other in any feasible three-dimensional configuration. For example, the rows and columns may be oriented at any angle relative to each other, may be oriented in a substantially horizontal plane or a substantially vertical plane, and/or may be oriented in a folded topology, among other possible three-dimensional configurations.

Memory cells can be coupled to different digit lines and word lines. For example, a first source/drain region of a transistor 202-1 can be coupled to digit line 205-1 (D), a second source/drain region of transistor 202-1 can be coupled to capacitor 203-1, and a gate of a transistor 202-1 can be coupled to word line 204-Y. A first source/drain region of a transistor 202-2 can be coupled to digit line 205-2 (D)_, a second source/drain region of transistor 202-2 can be coupled to capacitor 203-2, and a gate of a transistor 202-2 can be coupled to word line 204-X. A cell plate, as shown in FIG. 2, can be coupled to each of capacitors 203-1 and 203-2. The cell plate can be a common node to which a reference voltage (e.g., ground) can be applied in various memory array configurations.

The memory array 230 is configured to couple to sensing circuitry 250 in accordance with a number of embodiments of the present disclosure. In this embodiment, the sensing circuitry 250 comprises a sense amplifier 206 and a compute component 231 corresponding to respective columns of memory cells (e.g., coupled to respective pairs of complementary digit lines). The sense amplifier 206 can be coupled to the pair of complementary digit lines 205-1 and 205-2. The compute component 231 can be coupled to the sense amplifier 206 via pass gates 207-1 and 207-2. The gates of the pass gates 207-1 and 207-2 can be coupled to operation selection logic 213.

The operation selection logic 213 can be configured to include pass gate logic for controlling pass gates that couple the pair of complementary digit lines un-transposed between the sense amplifier 206 and the compute component 231 and swap gate logic for controlling swap gates that couple the pair of complementary digit lines transposed between the sense amplifier 206 and the compute component 231. The operation selection logic 213 can also be coupled to the pair of complementary digit lines 205-1 and 205-2. The operation selection logic 213 can be configured to control pass gates 207-1 and 207-2 based on a selected operation.

The sense amplifier 206 can be operated to determine a data value (e.g., logic state) stored in a selected memory cell. The sense amplifier 206 can comprise a cross coupled latch, which can be referred to herein as a primary latch. In the example illustrated in FIG. 2, the circuitry corresponding to sense amplifier 206 comprises a latch 215 including four transistors coupled to a pair of complementary digit lines (D) 205-1 and (D)_ 205-2. However, embodiments are not limited to this example. The latch 215 can be a cross coupled latch (e.g., gates of a pair of transistors) such as n-channel transistors (e.g., NMOS transistors) 227-1 and 227-2 are cross coupled with the gates of another pair of transistors, such as p-channel transistors (e.g., PMOS transistors) 229-1 and 229-2).

In operation, when a memory cell is being sensed (e.g., read), the voltage on one of the digit lines 205-1 (D) or 205-2 (D)_ will be slightly greater than the voltage on the other one of digit lines 205-1 (D) or 205-2 (D)_. An ACT signal and an RNL* signal can be driven low to enable (e.g., fire) the sense amplifier 206. The digit lines 205-1 (D) or 205-2 (D)_ having the lower voltage will turn on one of the PMOS transistor 229-1 or 229-2 to a greater extent than the other of PMOS transistor 229-1 or 229-2, thereby driving high the digit line 205-1 (D) or 205-2 (D)_ having the higher voltage to a greater extent than the other digit line 205-1 (D) or 205-2 (D)_ is driven high.

Similarly, the digit line 205-1 (D) or 205-2 (D)_ having the higher voltage will turn on one of the NMOS transistor 227-1 or 227-2 to a greater extent than the other of the NMOS transistor 227-1 or 227-2, thereby driving low the digit line 205-1 (D) or 205-2 (D)_ having the lower voltage to a greater extent than the other digit line 205-1 (D) or 205-2 (D)_ is driven low. As a result, after a short delay, the digit line 205-1 (D) or 205-2 (D)_ having the slightly greater voltage is driven to the voltage of the supply voltage V_(DD) through a source transistor, and the other digit line 205-1 (D) or 205-2 (D)_ is driven to the voltage of the reference voltage (e.g., ground) through a sink transistor. Therefore, the cross coupled NMOS transistors 227-1 and 227-2 and PMOS transistors 229-1 and 229-2 serve as a sense amplifier pair, which amplify the differential voltage on the digit lines 205-1 (D) and 205-2 (D)_ and operate to latch a data value sensed from the selected memory cell.

Embodiments are not limited to the sense amplifier 206 configuration illustrated in FIG. 2. As an example, the sense amplifier 206 can be a current-mode sense amplifier and a single-ended sense amplifier (e.g., sense amplifier coupled to one digit line). Also, embodiments of the present disclosure are not limited to a folded digit line architecture such as that shown in FIG. 2.

The sense amplifier 206 can, in conjunction with the compute component 231, be operated to perform various operations using data from an array as input. In a number of embodiments, the result of an operation can be stored back to the array without transferring the data via a digit line address access and/or moved between banks without using an external data bus (e.g., without firing a column decode signal such that data is transferred to circuitry external from the array and sensing circuitry via local I/O lines). As such, a number of embodiments of the present disclosure can enable performing operations and compute functions associated therewith using less power than various previous approaches. Additionally, since a number of embodiments provide an ability to transfer data bank to bank without the need to transfer data across local and/or global I/O lines and/or external data buses, a number of embodiments can enable an improved processing capability as compared to previous approaches.

The sense amplifier 206 can further include equilibration circuitry 214, which can be configured to equilibrate the digit lines 205-1 (D) and 205-2 (D)_. In this example, the equilibration circuitry 214 comprises a transistor 224 coupled between digit lines 205-1 (D) and 205-2 (D)_. The equilibration circuitry 214 also comprises transistors 225-1 and 225-2 each having a first source/drain region coupled to an equilibration voltage (e.g., V_(DD)/2), where V_(DD) is a supply voltage associated with the array. A second source/drain region of transistor 225-1 can be coupled digit line 205-1 (D), and a second source/drain region of transistor 225-2 can be coupled digit line 205-2 (D)_. Gates of transistors 224, 225-1, and 225-2 can be coupled together, and to an equilibration (EQ) control signal line 226. As such, activating EQ enables the transistors 224, 225-1, and 225-2, which effectively shorts digit lines 205-1 (D) and 205-2 (D)_ together and to the equilibration voltage (e.g., V_(DD)/2).

Although FIG. 2 shows sense amplifier 206 comprising the equilibration circuitry 214, embodiments are not so limited, and the equilibration circuitry 214 may be implemented discretely from the sense amplifier 206, implemented in a different configuration than that shown in FIG. 2, or not implemented at all.

As shown in FIG. 2, the compute component 231 can also comprise a latch, which can be referred to herein as a secondary latch 264. The secondary latch 264 can be configured and operated in a manner similar to that described above with respect to the primary latch 215. In this example, the pair of cross coupled p-channel transistors (e.g., PMOS transistors) included in the secondary latch have their respective sources coupled to a supply voltage 212-2 (e.g., V_(DD)), and the pair of cross coupled n-channel transistors (e.g., NMOS transistors) of the secondary latch have their respective sources selectively coupled to a reference voltage 212-1 (e.g., ground), such that the secondary latch is continuously enabled. The configuration of the compute component 231 is not limited to that shown in FIG. 2, and various other embodiments are feasible.

FIG. 3 is a schematic diagram illustrating circuitry for data transfer in a memory device in accordance with a number of embodiments of the present disclosure. FIG. 3 shows eight sense amplifiers (e.g., sense amplifiers 0, 1, . . . , 7 shown at 306-0, 306-1, . . . , 306-7, respectively) each coupled to a respective pair of complementary sense lines (e.g., digit lines 305-1 and 305-2). FIG. 3 also shows eight compute components (e.g., compute components 0, 1, . . . , 7 shown at 331-0, 331-1, . . . , 331-7) each coupled to a respective sense amplifier (e.g., as shown for sense amplifier 0 at 306-0) via respective pass gates 307-1 and 307-2 and digit lines 305-1 and 305-2. For example, the pass gates can be connected as shown in FIG. 2 and can be controlled by an operation selection signal, Pass. For example, an output of the selection logic can be coupled to the gates of the pass gates 307-1 and 307-2 and digit lines 305-1 and 305-2. Corresponding pairs of the sense amplifiers and compute components can contribute to formation of the sensing circuitry indicated at 350-0, 350-1, . . . , 350-7.

The sense amplifiers 306-0, 306-1, . . . , 306-7 in FIG. 3 can each correspond to sense amplifier 206 shown in FIG. 2. The compute components 331-0, 331-1, . . . , 331-7 shown in FIG. 3 can each correspond to compute component 231 shown in FIG. 2. A combination of one sense amplifier with one compute component can contribute to the sensing circuitry (e.g., 350-0, 350-1, . . . , 350-7) of a portion of a DRAM memory subarray 325 configured to a shared I/O (SIO) line 355 shared by a number of sensing component stripes for subarrays and/or latch components, as described herein. The paired combinations of the sense amplifiers 306-0, 306-1, . . . , 306-7 and the compute components 331-0, 331-1, . . . , 331-7, shown in FIG. 3, can be included in the sensing component stripe. In some embodiments, data can be transferred via the SIO lines 355 between a subarray and/or a bank and the BBT bus.

The memory device can include a number of sensing component stripes configured to include a number of a plurality of sense amplifiers and compute components (e.g., 306-0, 306-1, . . . , 306-7 and 331-0, 331-1, . . . , 331-7, respectively, as shown in FIG. 3) that can correspond to a number of the plurality of columns (e.g., 305-1 and 305-2 in FIG. 3) of the memory cells, where the number of sense amplifiers and/or compute components can be selectably coupled to the plurality of SIO lines (e.g., via column select circuitry 358-1 and 358-2). The column select circuitry can be configured to selectably sense data in a particular column of memory cells of a subarray by being selectably coupled to a plurality of (e.g., four, eight, and sixteen, among other possibilities) sense amplifiers and/or compute components.

The circuitry illustrated in FIG. 3 also shows column select circuitry 358-1 and 358-2 that is configured to implement data movement operations with respect to particular columns 322 of a subarray 325, the complementary digit lines 305-1 and 305-2 associated therewith, and the shared I/O line 355 (e.g., as directed by the controller 140 shown in FIGS. 1A-1B). For example, column select circuitry 358-1 has select lines 0, 2, 4, and 6 that are configured to couple with corresponding columns, such as column 0 (332-0), column 2, column 4, and column 6. Column select circuitry 358-2 has select lines 1, 3, 5, and 7 that are configured to couple with corresponding columns, such as column 1, column 3, column 5, and column 7. In a number of embodiments, by operating the SIO line 355, data values may be transferred between memory banks via the BBT bus, as described in more detail in connection with FIGS. 4A-4D, herein.

For example, as described herein, the array of memory cells can include an implementation of DRAM memory cells where the controller is configured, in response to a command, to move (e.g., copy, transfer, and/or transport) data from the source location to the destination location via a shared I/O line. In various embodiments, the source location can be in a first bank and the destination location can be in a second bank in the memory device and/or the source location can be in a first subarray of one bank in the memory device and the destination location can be in a second subarray of a different bank. According to embodiments, the data can be moved as described in connection with FIGS. 4A-4D. The first subarray and the second subarray can be in the same section of a bank or the subarrays can be in different sections of the bank.

While example embodiments including various combinations and configurations of sensing circuitry, sense amplifiers, compute components, sensing component stripes, shared I/O lines, column select circuitry, multiplexers, latch components, latch stripes, and/or latches, etc., have been illustrated and described herein, embodiments of the present disclosure are not limited to those combinations explicitly recited herein. Other combinations and configurations of the sensing circuitry, sense amplifiers, compute components, sensing component stripes, shared I/O lines, column select circuitry, multiplexers, latch components, latch stripes, and/or latches, etc., disclosed herein are expressly included within the scope of this disclosure.

FIG. 4A is block diagram illustrating a number of banks 421-0, . . . , 421-7 of a memory device 420 coupled to a BBT bus 432 in accordance with a number of embodiments of the present disclosure. The memory device 420 may include a plurality of memory banks 421-0, . . . , 421-7, which may be coupled to BBT bus 432. In FIG. 4A, the memory device includes additional logic 471, which can include, for example, controller(s) 140 and/or additional latches 170 as shown in FIG. 1A and/or other peripheral logic to which a plurality of shared I/O (SIO) lines 455-1, . . . , 455-8 can be coupled. The shared I/O lines 455-1, . . . , 455-8 may be provided for respective memory banks 421-0, . . . , 421-7. For example, a bank 421 can comprise 16K columns such that each shared I/O line 455-1, . . . , 455-8 may be coupled to 16K columns of memory cells, and may be multiplexed to move data to and/or from the respective memory banks 421-0, . . . , 421-7 (e.g., in 1 KB or 2 KB “chunks”).

The BBT bus 432 may include a plurality of BBT control components 433-1, . . . , 433-8 for managing data transfer between memory banks 421-0, . . . , 421-7. In some embodiments, the BBT control components 433-1, . . . , 433-8 may be used to compare a write address value and a read address value for designating addresses among the plurality of memory banks 421-0, . . . , 421-7 in association with data being transferred between the memory banks 421-0, . . . , 421-7. For example, the BBT control components 433-1, . . . , 433-8 may compare read and/or write information related to a first memory bank (e.g., memory bank 421-0) among the plurality of memory banks 421-0, . . . , 421-7 to determine a second memory bank (e.g., memory bank 421-3) to which data associated with first memory bank (e.g., memory bank 421-0) is to be transferred.

FIG. 4B is another block diagram illustrating a number of banks 421-0, . . . , 421-7 of a memory device 420 coupled to a BBT bus 432 in accordance with a number of embodiments of the present disclosure. The memory device 420 may include a plurality of memory banks 421-0, . . . , 421-7, which may be coupled to BBT bus 432. In FIG. 4B, the memory device includes additional logic 471, which can include, for example, controller(s) 140 and/or additional latches 170 as shown in FIG. 1A and/or other peripheral logic to which a plurality of shared I/O (SIO) lines 455-1, . . . , 455-8 can be coupled. The shared I/O lines 455-1, . . . , 455-8 may be provided for respective memory banks 421-0, . . . , 421-7. For example, a bank 421 can comprise 16K columns such that each shared I/O line 455-1, . . . , 455-8 may be coupled to 16K columns of memory cells, and may be multiplexed to move data to and/or from the respective memory banks 421-0, . . . , 421-7 (e.g., in 1 KB or 2 KB “chunks”). The BBT bus 432 may include a plurality of BBT control components 433-1, . . . , 433-8. In some embodiments, the BBT control components 433-1, . . . , 433-8 may be used to compare a write address value and a read address value for designating addresses among the plurality of memory banks 421-0, . . . , 421-7 prior to the data being transferred between the memory banks 421-0, . . . , 421-7.

As shown in FIG. 4B, data may be transferred between the memory banks 421-0, . . . , 421-7 unidirectionally around the BBT bus 432. For example, as shown in FIG. 4B, data may be transferred from bank 4 421-4 to bank 0 421-0 in an anticlockwise manner around the BBT bus 432, as indicated by the arrows.

As an example, the data from memory bank 4 421-4 may be transferred to BBT control component 433-5. The data may then be transferred around the BBT bus 432 from a BBT control component to a next BBT control component on the BBT bus 432. In the example of FIG. 4B, the data from bank 4 421-4 is subsequently transferred from BBT control component 433-5 to BBT control component 433-6. The data is then transferred to BBT control component 433-8, then to BBT control component 433-8, at which point the data is transferred to BBT control component 433-4. Subsequently, the data is transferred to BBT control component 433-2, then to BBT control component 433-1, and finally to BBT control component 433-1, at which point the data is transferred to bank 421-0. In some embodiments, the data may be transferred from bank 4 421-4 to BBT control component 433-5 via a shared signal line 455-5, and the data may be transferred from BBT control component 433-1 to bank 421-0 via a shared signal line 455-1.

In some embodiments, it may take approximately 2 nanoseconds for the data to be transferred to a memory bank (e.g., memory bank 421-0) or from a memory bank (e.g., memory bank 421-4) to a BBT control component 433-1, . . . , 433-8. Similarly, it may take approximately 2 nanoseconds to transfer data from one BBT control component (e.g., BBT control component 433-5) to a next BBT control component (e.g., BBT control component 433-6) on the BBT bus 432. Accordingly, it may take around 18 nanoseconds to transfer data from memory bank 4 421-4 to memory bank 421-0 via the unidirectional BBT bus 432 illustrated in FIG. 4B.

FIG. 4C is another block diagram illustrating a number of banks 421-0, . . . , 421-7 of a memory device 420 coupled to a BBT bus 432 in accordance with a number of embodiments of the present disclosure. The memory device 420 may include a plurality of memory banks 421-0, . . . , 421-7, which may be coupled to BBT bus 432. In FIG. 4C, the memory device includes additional logic 471, which can include, for example, controller(s) 140 and/or additional latches 170 as shown in FIG. 1A and/or other peripheral logic to which a plurality of shared I/O (SIO) lines 455-1, . . . , 455-8 can be coupled. The shared I/O lines 455-1, . . . , 455-8 may be provided for respective memory banks 421-0, . . . , 421-7. For example, a bank 421 can comprise 16K columns such that each shared I/O line 455-1, . . . , 455-8 may be coupled to 16K columns of memory cells, and may be multiplexed to move data to and/or from the respective memory banks 421-0, . . . , 421-7 (e.g., in 1 KB or 2 KB “chunks”).

In some embodiments, the BBT control component 433-1, . . . , 433-8 may be used to compare a write address value and a read address value for designating addresses among the plurality of memory banks 421-0, . . . , 421-7 prior to the data being transferred between the memory banks 421-0, . . . , 421-7.

Each BBT control component 433-1, . . . , 433-8 may be initiated to receive and/or transfer data. For example, each BBT control component 433-1, . . . , 433-8 may receive a signal or other information to initiate each BBT control component 433-1, . . . , 433-8 to receive and/or transfer data between the memory banks 421-0, . . . , 421-7. In some embodiments, the BBT control component 433-1, . . . , 433-8 can control the direction of data transfer around the BBT bus 432. For example, the BBT control component 433-1, . . . , 433-8 may control transfer of data between the memory banks 421-0, . . . , 421-7 such that some data transfers occur in a first direction and some of the data transfers occur in a second direction. In some embodiments, the first direction may be an anti-clockwise direction around the BBT bus 432 and the second direction may be a clockwise direction around the BBT bus 432.

As shown in FIG. 4C, data may be transferred between the memory banks 421-0, . . . , 421-7 bi-directionally around the BBT bus 432. For example, the BBT bus 432 may be configured to optimize data transfer between the memory banks 421-0, . . . , 421-7 such that an amount of time involved in transferring the data and/or an amount of power consumed in transferring the data is minimized. As described in connection with FIG. 4B, it may take approximately 2 nanoseconds for the data to be transferred to a memory bank (e.g., memory bank 0 421-0) or from a memory bank (e.g., memory bank 421-4) to a BBT control component 433-1, . . . , 433-8. Similarly, it may take approximately 2 nanoseconds to transfer data from one BBT control component (e.g., BBT control component 433-5) to a next BBT control component (e.g., BBT control component 433-6) on the BBT bus 432.

By allowing for bi-directional transfer of data around the BBT bus 432, the data may be able to be transferred along a path that is shorter (and therefore requires less time) than the unidirectional data transfer path illustrated in FIG. 4B. For example, as shown in FIG. 4C, data may be transferred from memory bank 4 421-4 to memory bank 421-0 in a clockwise manner, which reduces the number of BBT control components 433-1, . . . , 433-8 the data traverses as it is being transferred. In some embodiments, this may yield a reduction in the amount of time it takes for the data to be transferred from memory bank 421-4 to memory bank 421-0.

For example, in contrast to the unidirectional BBT bus 432 described in FIG. 4B in which it may take around 18 nanoseconds to transfer data from memory bank 421-4 to memory bank 421-0, it may only take around 4 nanoseconds to transfer data from memory bank 421-4 to memory bank 421-0 using the bi-directional BBT bus 432 illustrated in the example of FIG. 4C.

A bit may be included in the data to signify which direction the data is to be transferred between the memory banks 421-0, . . . , 421-7 around the BBT bus 432. For example, a bit may signify that the data is to be transferred to the left (D_(LEFT)), or the bit may signify that the data is to be transferred to the right (D_(RIGHT)). In some embodiments, the bit may be determined such that a time taken for data transfer between the memory banks 421-0, . . . , 421-7 is a shortest time for the data to be transferred. The bit may be read by the BBT control component 433-1, . . . , 433-8 and/or the controller (e.g., controller 140 in FIG. 1) to determine which direction to transfer data around the BBT bus 432.

FIG. 4D is another block diagram illustrating a number of banks 421-0, . . . , 421-7 of a memory device 420 coupled to a BBT bus 432 in accordance with a number of embodiments of the present disclosure. The memory device 420 may include a plurality of memory banks 421-0, . . . , 421-7, which may be coupled to BBT bus 432. In FIG. 4D, the memory device includes additional logic 471, which can include, for example, controller(s) 140 and/or additional latches 170 as shown in FIG. 1A and/or other peripheral logic to which a plurality of shared I/O (SIO) lines 455-1, . . . , 455-8 can be coupled. The shared I/O lines 455-1, . . . , 455-8 may be provided for respective memory banks 421-0, . . . , 421-7. For example, a bank 421 can comprise 16K columns such that each shared I/O line 455-1, . . . , 455-8 may be coupled to 16K columns of memory cells, and may be multiplexed to move data to and/or from the respective memory banks 421-0, . . . , 421-7 (e.g., in 1 KB or 2 KB “chunks”).

The BBT bus 432 may include a plurality of BBT control component 433-1, . . . , 433-8. In some embodiments, the BBT control component 433-1, . . . , 433-8 may be used to compare a write address value and a read address value for designating addresses among the plurality of memory banks 421-0, . . . , 421-7 prior to the data being transferred between the memory banks 421-0, . . . , 421-7.

As shown in FIG. 4D, data may be transferred between the memory banks 421-0, . . . , 421-7 based on where the memory bank that is sending the data and the memory bank that is receiving the data are located within the memory device 420. For example, data associated with memory bank 421-0 may be transferred to the right (e.g., in the clockwise direction) to memory bank 421-1. Data associated with memory bank 421-2 may be transferred to the left (e.g., in the anticlockwise direction) to memory bank 421-1, and data associated with memory bank 421-3 may be transferred to the left to memory bank 421-2 or to memory bank 421-1. Similarly, data associated with memory bank 421-4 may be transferred to the right to memory bank 421-5 and/or to memory bank 421-6, while data associated with memory bank 421-7 may be transferred to the left to memory bank 421-6.

In some embodiments, a controller may control transfer of the data between the memory banks 421-0, . . . , 421-7. For example a controller such as controller 140 illustrated in FIG. 1A may be coupled to the memory banks 421-0, . . . , 421-7 and/or to the BBT bus 432, and may be configured to control transfer of the data between the memory banks 421-0, . . . , 421-7. In some embodiments, the controller may determine a shortest path for the data transfer (e.g., a path that takes the shortest amount of time). For example, the controller may determine that a transfer of data between a first memory bank and a second memory bank among the memory banks 421-0, . . . , 421-7.

In some embodiments, the controller may be configured to determine how to transfer data to a particular memory bank among the memory banks 421-0, . . . , 421-7 such that a time associated with the data transfer is minimized. For example, the controller may be configured to determine that bank 421-6 is to receive data from memory bank 421-0, memory bank 421-5, and/or memory bank 421-7. The controller may then cause data from memory bank 421-7 to be transferred to the left to memory bank 421-6, and cause data from memory bank 421-4 and/or memory bank 421-5 to be transferred to the right to memory bank 421-6.

Similarly, the controller may be configured to determine that memory bank 421-1 is to receive data transferred from memory bank 421-0, memory bank 421-2, and/or memory bank 421-3. The controller may then cause data from memory bank 421-0 to be transferred to the right to memory bank 421-1, and cause data from memory bank 421-2 and/or memory bank 421-3 to be transferred to the left to memory bank 421-1. In some embodiments, the controller may be configured to transfer data between the memory banks 421 via the BBT bus 432 concurrently with data being transferred to a memory array via a separate internal bus and/or external data bus.

In some embodiments, the controller may be configured to reconfigure which memory bank(s) are to receive data and which memory bank(s) are to transfer data upon completion of a prior data transfer between the memory banks 421-0, . . . , 421-7.

As described in connection with FIG. 4C, a bit may be included in the data to signify which direction the data is to be transferred between the memory banks 421-0, . . . , 421-7 around the BBT bus 432. For example, a bit may signify that the data is to be transferred to the left (D_(LEFT)), or the bit may signify that the data is to be transferred to the right (D_(RIGHT)). In some embodiments, the bit may be determined such that data transfer between the memory banks 421-0, . . . , 421-7 is optimized.

In some embodiments, the controller may be configured to organize the memory banks 421-0, . . . , 421-7 such that a particular memory bank (e.g., memory bank 421-1) receives data from other memory banks (e.g., memory bank 421-0, memory bank 421-2, memory bank 421-3, etc.) in an optimized manner. As an example, if a program (e.g., a PIM program) is running on a particular memory bank (e.g., memory bank 421-1), the BBT bus 432 may be bifurcated such that the particular memory bank receives data transferred from other memory banks directly and/or in an optimized manner.

As another example, if multiple programs (e.g., multiple PIM programs) are running with large data sets, the BBT bus 432 may be reconfigured for each data transfer request. For example, the BBT bus 432 may be configured to transfer data to a particular memory bank (e.g., memory bank 421-1). Once the particular memory bank has received the data that was to be transferred, the BBT bus 432 may be reconfigured to transfer data to a different memory bank (e.g., memory bank 421-6). In some embodiments, the directions that data will be transferred between the memory banks 421-0, . . . , 421-7 may change in response to the reconfiguration such that the transfer of data is optimized (e.g., such that a path of data transfer that yields a shortest time for the data transfer is chosen) based on the memory bank (e.g., memory bank 421-6) that will receive the data transfer. In some embodiments, prior to reconfiguring the BBT bus 432, all data that is still on the BBT bus 432 may be cleared or deleted so that data transfers that were in flight prior to the reconfiguration do not interfere with the reconfiguration.

FIG. 5 is a schematic diagram illustrating sensing circuitry capable of implementing an XOR logical operation in accordance with a number of embodiments of the present disclosure. FIG. 5 shows a sense amplifier 506 coupled to a pair of complementary sense lines 505-1 and 505-2, logical operation select logic 513, and a compute component 531 coupled to the sense amplifier 506 via pass gates 507-1 and 507-2. The sense amplifier 506 shown in FIG. 5 can correspond to sense amplifier 206 shown in FIG. 2. The compute component 531 shown in FIG. 5 can correspond to sensing circuitry, including compute component, 150 in FIG. 1A. The logical operation selection logic 513 shown in FIG. 5 can correspond to logical operation selection logic 213 shown in FIG. 2. The gates of the pass gates 507-1 and 507-2 can be controlled by a logical operation selection logic 513 signal, (e.g., Pass). For example, an output of the logical operation selection logic 513 can be coupled to the gates of the pass gates 507-1 and 507-2. Further, the compute component 531 can comprise a loadable shift register configured to shift data values left and right.

According to the embodiment illustrated in FIG. 5, the compute components 531 can comprise respective stages (e.g., shift cells) of a loadable shift register configured to shift data values left and right. For example, as illustrated in FIG. 5, each compute component 531 (e.g., stage) of the shift register comprises a pair of right-shift transistors 581 and 586, a pair of left-shift transistors 589 and 590, and a pair of inverters 587 and 588. The signals PHASE 1R, PHASE 2R, PHASE 1L, and PHASE 2L can be applied to respective control lines 582, 583, 591 and 592 to enable/disable feedback on the latches of the corresponding compute components 531 in association with performing logical operations and/or shifting data in accordance with embodiments described herein.

The sensing circuitry shown in FIG. 5 shows operation selection logic 513 coupled to a number of logic selection control input control lines, including ISO, TF, TT, FT, and FF. Selection of a logical operation from a plurality of logical operations is determined from the condition of logic selection control signals on the logic selection control input lines, as well as the data values present on the pair of complementary sense lines 505-1 and 505-2 when isolation transistors 550-1 and 550-2 are enabled via an ISO control signal being asserted.

According to various embodiments, the operation selection logic 513 can include four logic selection transistors: logic selection transistor 562 coupled between the gates of the swap transistors 542 and a TF signal control line, logic selection transistor 552 coupled between the gates of the pass gates 507-1 and 507-2 and a TT signal control line, logic selection transistor 554 coupled between the gates of the pass gates 507-1 and 507-2 and a FT signal control line, and logic selection transistor 564 coupled between the gates of the swap transistors 542 and a FF signal control line. Gates of logic selection transistors 562 and 552 are coupled to the true sense line through isolation transistor 550-1 (having a gate coupled to an ISO signal control line). Gates of logic selection transistors 564 and 554 are coupled to the complementary sense line through isolation transistor 550-2 (also having a gate coupled to an ISO signal control line).

Data values present on the pair of complementary sense lines 505-1 and 505-2 can be loaded into the compute component 531 via the pass gates 507-1 and 507-2. The compute component 531 can comprise a loadable shift register. When the pass gates 507-1 and 507-2 are OPEN, data values on the pair of complementary sense lines 505-1 and 505-2 are passed to the compute component 531 and thereby loaded into the loadable shift register. The data values on the pair of complementary sense lines 505-1 and 505-2 can be the data value stored in the sense amplifier 506 when the sense amplifier is fired. In this example, the logical operation selection logic signal, Pass, is high to OPEN the pass gates 507-1 and 507-2.

The ISO, TF, TT, FT, and FF control signals can operate to select a logical function to implement based on the data value (“B”) in the sense amplifier 506 and the data value (“A”) in the compute component 531. In particular, the ISO, TF, TT, FT, and FF control signals are configured to select the logical function to implement independent from the data value present on the pair of complementary sense lines 505-1 and 505-2 (although the result of the implemented logical operation can be dependent on the data value present on the pair of complementary sense lines 505-1 and 505-2. For example, the ISO, TF, TT, FT, and FF control signals select the logical operation to implement directly since the data value present on the pair of complementary sense lines 505-1 and 505-2 is not passed through logic to operate the gates of the pass gates 507-1 and 507-2.

Additionally, FIG. 5 shows swap transistors 542 configured to swap the orientation of the pair of complementary sense lines 505-1 and 505-2 between the sense amplifier 506 and the compute component 531. When the swap transistors 542 are OPEN, data values on the pair of complementary sense lines 505-1 and 505-2 on the sense amplifier 506 side of the swap transistors 542 are oppositely-coupled to the pair of complementary sense lines 505-1 and 505-2 on the compute component 531 side of the swap transistors 542, and thereby loaded into the loadable shift register of the compute component 531.

The logical operation selection logic 513 signal Pass can be activated (e.g., high) to OPEN the pass gates 507-1 and 507-2 (e.g., conducting) when the ISO control signal line is activated and either the TT control signal is activated (e.g., high) with data value on the true sense line is “1” or the FT control signal is activated (e.g., high) with the data value on the complement sense line is “1.”

The data value on the true sense line being a “1” OPENs logic selection transistors 552 and 562. The data value on the complimentary sense line being a “1” OPENs logic selection transistors 554 and 564. If the ISO control signal or either the respective TT/FT control signal or the data value on the corresponding sense line (e.g., sense line to which the gate of the particular logic selection transistor is coupled) is not high, then the pass gates 507-1 and 507-2 will not be OPENed by a particular logic selection transistor.

The logical operation selection logic signal Pass* can be activated (e.g., high) to OPEN the swap transistors 542 (e.g., conducting) when the ISO control signal line is activated and either the TF control signal is activated (e.g., high) with data value on the true sense line is “1,” or the FF control signal is activated (e.g., high) with the data value on the complement sense line is “1.” If either the respective control signal or the data value on the corresponding sense line (e.g., sense line to which the gate of the particular logic selection transistor is coupled) is not high, then the swap transistors 542 will not be OPENed by a particular logic selection transistor.

The Pass* control signal is not necessarily complementary to the Pass control signal. It is possible for the Pass and Pass* control signals to both be activated or both be deactivated at the same time. However, activation of both the Pass and Pass* control signals at the same time shorts the pair of complementary sense lines together, which may be a disruptive configuration to be avoided.

The sensing circuitry illustrated in FIG. 5 is configured to select one of a plurality of logical operations to implement directly from the four logic selection control signals (e.g., logical operation selection is not dependent on the data value present on the pair of complementary sense lines). Some combinations of the logic selection control signals can cause both the pass gates 507-1 and 507-2 and swap transistors 542 to be OPEN at the same time, which shorts the pair of complementary sense lines 505-1 and 505-2 together. According to a number of embodiments of the present disclosure, the logical operations which can be implemented by the sensing circuitry illustrated in FIG. 5 can be the logical operations summarized in the logic tables shown in FIG. 6.

FIG. 6 is a logic table illustrating selectable logic operation results implemented by a sensing circuitry shown in FIG. 7 in accordance with a number of embodiments of the present disclosure. The four logic selection control signals (e.g., TF, TT, FT, and FF), in conjunction with a particular data value present on the complementary sense lines, can be used to select one of plural logical operations to implement involving the starting data values stored in the sense amplifier 506 and compute component 531. The four control signals, in conjunction with a particular data value present on the complementary sense lines, controls the continuity of the pass gates 507-1 and 507-2 and swap transistors 542, which in turn affects the data value in the compute component 531 and/or sense amplifier 506 before/after firing. The capability to selectably control continuity of the swap transistors 542 facilitates implementing logical operations involving inverse data values (e.g., inverse operands and/or inverse result), among others.

Logic Table 6-1 illustrated in FIG. 6 shows the starting data value stored in the compute component 531 shown in column A at 644, and the starting data value stored in the sense amplifier 506 shown in column B at 645. The other 3 column headings in Logic Table 6-1 refer to the continuity of the pass gates 507-1 and 507-2, and the swap transistors 542, which can respectively be controlled to be OPEN or CLOSED depending on the state of the four logic selection control signals (e.g., TF, TT, FT, and FF), in conjunction with a particular data value present on the pair of complementary sense lines 505-1 and 505-2. The “Not Open” column corresponds to the pass gates 507-1 and 507-2 and the swap transistors 542 both being in a non-conducting condition, the “Open True” corresponds to the pass gates 507-1 and 507-2 being in a conducting condition, and the “Open Invert” corresponds to the swap transistors 542 being in a conducting condition. The configuration corresponding to the pass gates 507-1 and 507-2 and the swap transistors 542 both being in a conducting condition is not reflected in Logic Table 6-1 since this results in the sense lines being shorted together.

Via selective control of the continuity of the pass gates 507-1 and 507-2 and the swap transistors 542, each of the three columns of the upper portion of Logic Table 6-1 can be combined with each of the three columns of the lower portion of Logic Table 6-1 to provide 3×3=9 different result combinations, corresponding to nine different logical operations, as indicated by the various connecting paths shown at 675. The nine different selectable logical operations that can be implemented by the sensing circuitry are summarized in Logic Table 6-2 illustrated in FIG. 6, including an XOR logical operation.

The columns of Logic Table 6-2 illustrated in FIG. 6 show a heading 680 that includes the state of logic selection control signals. For example, the state of a first logic selection control signal is provided in row 676, the state of a second logic selection control signal is provided in row 677, the state of a third logic selection control signal is provided in row 678, and the state of a fourth logic selection control signal is provided in row 679. The particular logical operation corresponding to the results is summarized in row 647.

Although specific embodiments have been illustrated and described herein, those of ordinary skill in the art will appreciate that an arrangement calculated to achieve the same results can be substituted for the specific embodiments shown. This disclosure is intended to cover adaptations or variations of one or more embodiments of the present disclosure. It is to be understood that the above description has been made in an illustrative fashion, and not a restrictive one. Combination of the above embodiments, and other embodiments not specifically described herein will be apparent to those of skill in the art upon reviewing the above description. The scope of the one or more embodiments of the present disclosure includes other applications in which the above structures and processes are used. Therefore, the scope of one or more embodiments of the present disclosure should be determined with reference to the appended claims, along with the full range of equivalents to which such claims are entitled.

In the foregoing Detailed Description, some features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the disclosed embodiments of the present disclosure have to use more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment. 

What is claimed is:
 1. An apparatus, comprising: a bank-to-bank transfer (BBT) bus coupled to a plurality of banks of memory cells; and a controller coupled to the BBT bus and configured to: determine a shortest transfer time for transfer of data between the plurality of banks; and control transfer of data between the plurality of banks based on the determination.
 2. The apparatus of claim 1, wherein the controller is further configured to determine the shortest transfer time and control transfer of the data without transferring the data to circuitry external to the plurality of banks.
 3. The apparatus of claim 1, wherein the controller is further configured to determine the shortest transfer time and control transfer of the data without transferring the data via an external bus interface coupled to the plurality of banks.
 4. The apparatus of claim 1, wherein the BBT bus comprises a token ring architecture.
 5. The apparatus of claim 1, wherein the controller is further configured to control transfer of the data by controlling transfer of first data in a first direction around the BBT bus and controlling transfer of second data in a second direction around the BBT bus.
 6. The apparatus of claim 5, wherein the controller is further configured to control transfer in the first direction concurrently with transfer in the second direction.
 7. The apparatus of claim 1, wherein the controller is further configured to reconfigure the BBT bus based, at least in part, on the determination.
 8. The apparatus of claim 7, wherein the controller is further configured to cause data on the BBT bus to be cleared from the BBT bus in response to reconfiguration of the BBT bus.
 9. A system, comprising: a host; a memory device coupled to the host and comprising a bank-to-bank transfer (BBT) bus coupled to each of a plurality of memory banks, wherein the memory device is configured to: receive a command from the host to initiate a data transfer operation; cause a transfer of first data between the plurality of memory banks in a first direction in response to a determination that transfer of first data in the first direction yields a shortest transfer time of data between the plurality of memory banks; and transfer second data between the plurality of memory banks in a second direction in response to a determination that transfer of second data in the second direction yields a shortest transfer time of data between the plurality of memory banks.
 10. The system of claim 9, wherein the first direction and the second direction are opposite directions.
 11. The system of claim 9, wherein the BBT bus is to control transfer of the first data and the second data without transferring data from the memory device to the host.
 12. The system of claim 9, further comprising an external bus configured to transfer data from the plurality of banks to a memory array coupled to the banks concurrently with transfer of the first data and the second data via the BBT bus.
 13. The system of claim 9, wherein the BBT bus is further configured to transfer the first data in the first direction concurrently with transfer of the second data in the second direction.
 14. The system of claim 9, wherein the BBT bus is configured to transfer the first data, the second data, or combinations thereof, according to a first in first out policy.
 15. The system of claim 9, wherein the memory device further comprises a controller coupled to the BBT bus and configured to cause the BBT bus to be reconfigured to optimize transfer of the first data, the second data, or combinations thereof.
 16. A method, comprising: determining, by a controller coupled to a bank-to-bank transfer (BBT) bus, a shortest transfer time for transfer of data between a plurality of memory banks that are coupled to the BBT bus; and controlling, by the controller, transfer of data between the plurality of memory banks based on the determination.
 17. The method of claim 16, further comprising: determining, by the controller, the shortest transfer time without transferring the data to circuitry external to the plurality of memory banks; and controlling, by the controller, the transfer of data between the plurality of memory banks time without transferring the data to circuitry external to the plurality of memory banks.
 18. The method of claim 16, further comprising: reconfiguring, by the controller, the BBT bus based, at least in part on the determination; and causing, by the controller, data on the BBT bus to be cleared from the BBT bus in response to reconfiguration of the BBT bus.
 19. The method of claim 16, further comprising controlling, by the controller, transfer of first data in a first direction around the BBT bus and controlling transfer of second data in a second direction around the BBT bus.
 20. The method of claim 16, further comprising controlling, by the controller, transfer of the first data in the first direction concurrently with transfer of the second data in the second direction. 